Knee brace



FIG. 1 is a perspective view of a knee brace, showing my design;

FIG. 2 is a front elevational view of the brace of FIG. 1;

FIG. 3 is a first side elevational view of the brace of FIG. 1;

FIG. 4 is a second side elevational view of the brace of FIG. 1;

FIG. 5 is a rear elevational view of the brace of FIG. 1;

FIG. 6 is top plan view of the brace of FIG. 1; and,

FIG. 7 is bottom plan view of the brace of FIG. 1. 

The ornamental design for a knee brace, as shown and described. 